#include <stdio.h>

int main(void)
{
    for (int i = 1; i <= 9; i++)
    {
        for (int j = 1; j <= i; j++)
        {
            printf("%4d ", j * i);
        }

        printf("\n");
    }

    // printf("The answer is: %d", 15+37);

    getchar();
}